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<title>[10480] sites/trunk/wp-themes.com/public_html/wp-content/mu-plugins/pub/starter-content.php: Theme Previews: Starter Content: Polyfill in `is_customize_preview()` to avoid having to statically define the starter content files to include for 2020/2021/other themes.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="http://meta.trac.wordpress.org/changeset/10480">10480</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"http://meta.trac.wordpress.org/changeset/10480","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>dd32</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2020-12-02 04:24:34 +0000 (Wed, 02 Dec 2020)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Theme Previews: Starter Content: Polyfill in `is_customize_preview()` to avoid having to statically define the starter content files to include for 2020/2021/other themes.
See <a href="http://meta.trac.wordpress.org/ticket/30">#30</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#sitestrunkwpthemescompublic_htmlwpcontentmupluginspubstartercontentphp">sites/trunk/wp-themes.com/public_html/wp-content/mu-plugins/pub/starter-content.php</a></li>
</ul>
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<h3>Diff</h3>
<a id="sitestrunkwpthemescompublic_htmlwpcontentmupluginspubstartercontentphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: sites/trunk/wp-themes.com/public_html/wp-content/mu-plugins/pub/starter-content.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- sites/trunk/wp-themes.com/public_html/wp-content/mu-plugins/pub/starter-content.php 2020-12-01 05:59:22 UTC (rev 10479)
+++ sites/trunk/wp-themes.com/public_html/wp-content/mu-plugins/pub/starter-content.php 2020-12-02 04:24:34 UTC (rev 10480)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -14,7 +14,67 @@
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> private $mapping = array();
</span><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ public function __construct() {
+ // This plugin relies upon the object cache being the internal WordPress per-request cache.
+ if ( wp_using_ext_object_cache() ) {
+ return;
+ }
+
+ // Some themes require is_customize_preview() before loading starter content.
+ add_action( 'after_setup_theme', array( $this, 'pre_after_setup_theme' ), -1 * PHP_INT_MAX );
+
+ add_action( 'init', array( $this, 'init' ) );
+ add_action( 'wp_head', array( $this, 'head_debug_info' ), 1 );
+ }
+
+ public function pre_after_setup_theme() {
+ if ( class_exists( 'WP_Customize_Manager' ) ) {
+ return;
+ }
+
+ if ( ! $this->is_supported_theme() ) {
+ return;
+ }
+
+ // Disable customizer loading parameters.
+ unset(
+ $_REQUEST['wp_customize'],
+ $_REQUEST['customize_changeset_uuid'],
+ $_GET['customize_changeset_uuid'],
+ $_POST['customize_changeset_uuid']
+ );
+
+ // Define a custom `WP_Customize_Manager` class to force `is_customize_preview()` truthful.
+ polyfill_wp_customize_manager();
+
+ $GLOBALS['wp_customize'] = new WP_Customize_Manager();
+
+ // Undo this the override after this action is fully run.
+ add_action(
+ 'after_setup_theme',
+ function() {
+ unset( $GLOBALS['wp_customize'] );
+ },
+ PHP_INT_MAX
+ );
+ }
+
+ private function is_supported_theme() {
+ $whitelisted_themes = array(
+ // Other default themes don't have supported starter content.
+ 'twentyseventeen',
+ 'twentytwenty',
+ 'twentytwentyone',
+ );
+
+ return in_array( get_template(), $whitelisted_themes );
+ }
+
</ins><span class="cx" style="display: block; padding: 0 10px"> public function init() {
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if ( ! $this->is_supported_theme() ) {
+ return;
+ }
+
</ins><span class="cx" style="display: block; padding: 0 10px"> $this->set_starter_content();
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> if ( empty( $this->starter_content ) ) {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -31,6 +91,15 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $this->filter_theme_mods();
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ public function head_debug_info() {
+ if ( current_theme_supports( 'starter-content' ) && $this->starter_content ) {
+ echo "\n<!-- Preview using Starter content -->\n";
+ } else {
+ echo "\n<!-- Preview is not using Starter content -->\n";
+ }
+
+ }
+
</ins><span class="cx" style="display: block; padding: 0 10px"> public function cache_posts() {
</span><span class="cx" style="display: block; padding: 0 10px"> foreach ( $this->starter_content['posts'] as $post ) {
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -441,34 +510,31 @@
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-add_action(
- 'init',
- function () {
- // This plugin relies upon the object cache being the internal WordPress per-request cache.
- if ( wp_using_ext_object_cache() ) {
- return;
- }
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+new Starter_Content();
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $whitelisted_themes = array(
- // Other default themes don't have supported starter content.
- 'twentyseventeen',
- 'twentytwenty',
- 'twentytwentyone',
- );
-
- if ( ! in_array( get_template(), $whitelisted_themes ) ) {
- return;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+/**
+ * Define a custom WP_Customize_Manager class that claims this request is a customizer preview request.
+ *
+ * This is needed as many themes (including 2020/2021) limit starter content to customizer preview requests.
+ *
+ * As PHP cannot handle nested classes, this is defined in a function outside of the above class.
+ */
+function polyfill_wp_customize_manager() {
+ class WP_Customize_Manager {
+ // Yes, this is a theme preview.
+ function is_preview() {
+ return true;
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- // These themes don't always load the starter content, so we'll have to do it for them..
- if ( 'twentytwenty' === get_template() ) {
- require_once get_template_directory() . '/inc/starter-content.php';
- add_theme_support( 'starter-content', twentytwenty_get_starter_content() );
- } elseif ( 'twentytwentyone' === get_template() ) {
- require_once get_template_directory() . '/inc/starter-content.php';
- add_theme_support( 'starter-content', twenty_twenty_one_get_starter_content() );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // Ensure that any calls return false too.
+ function __get( $property ) {
+ return false;
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ function __call( $method, $args ) {
+ return false;
+ }
+ }
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- ( new Starter_Content() )->init();
- }
-);
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // This needs to be defined in the global namespace.
+ class_alias( __NAMESPACE__ . '\WP_Customize_Manager', 'WP_Customize_Manager', false );
+}
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of file
</span></span></pre>
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